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Circular formwork for columns is a reusable mold used to shape concrete columns during construction. It comes in different types, including:
Steel Circular Column Formwork
Steel formwork for concrete columns is preferred in large construction projects due to its high strength and reusability. It's easy to assemble and disassemble, providing accurate column shapes and surfaces. Steel formwork is durable, capable of withstanding high concrete pressures during pouring, and resistant to deformation. It offers a smooth concrete finish, reducing the need for post-construction column treatment. Although initial costs may be higher than other materials, its reusability in extensive projects makes it cost-effective over time.
Aluminum Circular Column Formwork
This is lightweight and easy to handle, making it suitable for projects where manual labor is preferred over heavy machinery. Aluminum formwork is rust-resistant, ensuring a long lifespan and consistent column surface finish. It's designed to minimize assembly and disassembly time, enhancing construction efficiency. The aluminum material provides a smooth concrete finish, and its modular design allows for the formation of various column sizes and shapes. Although the initial cost is high, its advantages in terms of construction speed and concrete quality can offset the expense.
Plastic Circular Column Formwork
Plastic formwork is lightweight and easy to handle, making it suitable for small to medium-sized construction projects. It's resistant to moisture, ensuring durability and consistent column surface finish. Plastic formwork is often designed for quick assembly and disassembly, enhancing construction speed. It's reusable, making it environmentally friendly, and offers a smooth concrete finish. Additionally, it's resistant to chemical attacks, ensuring the form's integrity throughout the construction process.
Fabric Circular Column Formwork
Fabric formwork is circular column molds made from high-strength, concrete-resistant fabrics. It's lightweight, easy to transport, and assemble, making it suitable for projects in areas with limited access. Fabric formwork is designed to adapt to various column sizes and shapes, providing flexibility in construction. It's an innovative solution for creating textured concrete surfaces, enhancing the aesthetic appeal of finished structures, and offering insulation properties, reducing the risk of moisture loss during the curing process. Additionally, it's cost-effective for projects requiring multiple column sizes.
Support and Shape:
The circular column formwork helps support and shape the concrete as it is poured. It keeps the wet concrete in the desired round shape and supports it until the concrete hardens into a column. This allows builders to create strong, round columns for buildings and bridges.
Material and Construction:
The formwork is usually made from wood, metal, or plastic. Metal and wood are common for circular column forms because they are strong and can be adjusted to different sizes. The formwork is built in two pieces that can fit over the column like a shell. This allows the forms to be removed easily once the concrete sets.
Adjustability:
The circular column formwork can be made adjustable. This means one set of formwork can be used to create columns of different sizes. Special metal clamps or bolts are used to hold the column forms securely at the desired diameter. This adjustment feature saves money and time since different-sized columns don't need unique forms.
Ease of Use:
These forms are straightforward to put together and take apart. They lock in place so that the concrete can be poured safely without falling over. Once the concrete dries, the forms are released from the column and removed quickly.
Quality Finish:
The circular column formwork produces smooth, round columns with a nice surface texture. Metal or smooth wood makes up the inside of the forms, giving the concrete a polished finish that looks good and is strong.
Multiple Column Pouring:
There are special kit sets for circular formwork that allow multiple columns to be poured at once. This helps speed up construction when many round columns are needed.
Ease of Transport:
The formwork can be taken apart into smaller, lighter pieces that fit in trucks for delivery to job sites.
Stability and Safety:
Once the concrete is inside, the formwork is stable. It is secured with strong props, bracing, and ties to support the weight safely while the concrete sets.
Circular formwork for columns has several application scenarios. Here are some of them.
Reinforced concrete columns
Column formwork is applied in constructing reinforced concrete columns. It provides support and shapes the concrete when it cures. These columns add stability and strength to the building. They also have the circular shape built with formwork.
Bridge piers
Piers are structural bridges that transfer loads from beams and girders to the ground. Circular formwork creates piers for their stability and easy load distribution. The piers are usually tall and need concrete formwork to maintain their structure during the curing process.
Water tanks and silos
Water storage tanks and silos have large concrete walls and cylindrical shapes. Circular formwork is used to create their walls. This is because it can easily fit into the circular wall shape and maintain their structure as concrete cures.
Columns in high-rise buildings
High-rise buildings have columns to support the heavy weight of multiple floors. Circular formwork is used to create columns with concrete materials. Once the concrete cures, these columns support the building structures effectively.
Architectural features
These are specific features in a building that add to its aesthetic appeal and architectural value. These features include circular staircases and entryways. Circular formwork is used to create these features with concrete materials.
Column Size and Height
The size and height of the planned columns greatly influence the choice of circular column formwork. For larger diameters or taller columns, adjustable metal column forms may be optimal due to their reusability and cost-effectiveness. Conversely, for smaller diameters, plastic or fiberglass formworks may be suitable, offering lighter weights and easier handling on-site.
Concrete Mix and Pouring Method
The type of concrete mix and the pouring method can affect formwork selection. If using a high-slump concrete mix, ensure the formwork can handle the concrete's weight and pressure without deforming. Moreover, for pumped concrete, verify that the formwork is compatible with pump operations.
Project Budget and Timeline
Budget constraints and project timelines play a crucial role in the decision-making process. If the project has a tight budget, consider cost-effective solutions like adjustable metal forms, which can be reused in future projects. However, if time is of the essence, opt for quick-assembly options such as aluminum forms or plastic forms that require minimal manpower to set up.
Site Conditions and Accessibility
Evaluate the site's physical conditions and any restrictions. If working in a confined space, prioritize formwork that can be easily maneuvered and assembled, such as flexible column formwork. Additionally, consider the site's topography; for rough terrains, opt for more robust and stable formwork solutions.
Concrete Finish Requirements
The desired finish of the cured concrete surface should guide formwork selection. If a high-quality, smooth finish is required, consider using steel or aluminum formworks. These materials provide a superior surface texture. On the other hand, if a rough texture is acceptable, plywood formworks may suffice.
Sustainability Considerations
For projects prioritizing sustainability, opt for circular formwork that emphasizes reusability and recyclability. Consider adjustable metal forms, which can be used across multiple projects, reducing material waste. Additionally, assess the materials' lifespan; aluminum forms, for instance, can last many years, contributing to the project's sustainability goals.
Q1: How are formwork circular column molds removed from concrete?
A1: Circular column formwork can be removed easily using release agents. The agents not only allow easy removal but also help in achieving a smooth concrete surface.
Q2: How are circular formwork for columns kept in place during pouring?
A2: Circular formwork is held in place using braces. The braces are usually placed at an angle to distribute the pressure from the wet concrete evenly.
Q3: Are circular column formworks reusable?
A3: Yes, circular column formworks can be reused several times. However, this will depend on the type of material used to make the formwork. For instance, steel formworks are highly durable and can be reused up to 100 times. On the other hand, plywood formworks have a lower reuse potential and can be reused 5 to 7 times.
